Question about 1997 GMC Yukon
Courtesy lights have a 3 position switch 1 is for doors open --on /off 2 is for light off permanent and 3 is for light on in car permanent for reading etc. Other than that check the door switches for a permanent earth fault.
Posted on Apr 23, 2013
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Posted on Jan 02, 2017
SOURCE: courtesy lights dont turn off
in the door jam you have aswicth, myte be cover with
rubber skin remove the rubber and unsrew the little
switch and replace it with anew one start with driver
door its the most used ( remove fuse first)
Posted on Apr 18, 2009
THEY MAKE THE SYSTEM AND HAVE INSTRUCTIONS YOU CAN DOWNLOAD.
PLEASE NOTE: NOT ALL BRANDS/MODELS OF OPENER WILL WORK WITH THIS SYSTEM.
HOPE THIS HELPS
Posted on May 26, 2010
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Dec 04, 2016 | Buick Cars & Trucks
Sep 06, 2015 | 2001 GMC Jimmy
The liftgate lamps
The courtesy lamp supply voltage circuit of the body control module (BCM) supplies battery positive voltage to the dome lamp, the liftgate lamps, and the map lamps. When any door is opened, the door jamb switch contacts close providing a door open input to the BCM. The BCM then provides a ground to the interior lamps with the switch in the AUTO position. The interior lamps receive a ground at G401 with the switch in the ON position.
Important: If the liftgate is opened after all the modules go to sleep, the dome light will not come on. The liftgate ajar switch input to the BCM will not wake up the BCM once it has gone to sleep, so the dome light will not come on. Once the BCM gets an input to wake it up, from remote keyless entry (RKE) or a door handle, the dome light will turn on when the liftgate is opened.
If the driver inadvertently leaves any interior lamp ON, the BCM will turn it OFF after a 20 minute time-out.
The courtesy lamps will turn OFF immediately if the ignition switch is turned to the ON position or approximately 20 seconds after all doors are closed.
The courtesy lamps are controlled by the body control module (BCM). Inputs from the dome lamp switch and the door ajar switches are monitored by the BCM. When a door ajar switch is closed, or the dome lamp switch is turned to the ON position, the BCM supplies the B+ for the courtesy lamps.
With out a factory Tech2 scan tool or equivalent an knowing how these systems work ,you best bet is to take your vehicle to the dealer or some other ASE certified repair shop !
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